I was going to go one piece RCV but my shop guy went that route and talked me out of it. He didnt like the way it drove and was noisier. Per him if he were to do it again he'd go two peice. I called the RCV peeps and per them it's less then 5% difference in strength between the two. When you add the strength of the upgrade that amount is a distinction without much difference.the driveshaft is always turning. If you’re running aggressive or higher caster especially theres a strong possibility you’ll get vibration. If you break a two piece shaft, the probability of other damage is very high. The strength difference is relatively minor and unnecessary. I’m all about simplifying complicated systems or removing fail points and the only real way to do that with a m210 is replacing it with an axle that doesn’t have FAD. If that’s not an option upgrading the shafts to two piece works great
Still, I'd rather not have a two piece unit. If and when someone comes up with a locking hub design I'd go that route. I would have done the 44 axle replacement by dynatrac but no locking hubs. And 60s are overkill.